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Postings from May 2003
Michael G Schwern <schwern@pobox.com> wrote:
> On Tue, May 13, 2003 at 11:56:50PM +0200, Rafael Garcia-Suarez wrote:
> > $; is the subscript separator for multidimensional array emulation
> > (as says perlvar). Basically it works like this :
> >
> > $ perl -MO=Deparse -e '$x{1,2}'
> > $x{join $;, 1, 2};
> >
> > In our Unicode and UTF8 world, it's becoming more and more unsafe to use
> > that kind of hack, esp. when better alternative solutions are available.
Let me apologize for that FUD.
I forgot about the UTF8 flag on hash keys.
> > I therefore suggest to add to 5.9 a deprecation warning
> >
> > "Use of multidimensional array emulation is deprecated"
> >
> > for any use of the implicit join($;,...).
>
> FWIW, Tie::Math makes good use of it because writing tied, multi-dimensional
> data structures is a pain in the ass. Its easier to handle: $tied{1,2,3}
> than $tied{1}{2}{3}.
However, there is no real significant advantage over $tied{"$a,$b,$c"}.
At least when the number of dimensions is constant (as in every good
universe ;-)
> Its also smaller and faster than working with multidimensional data
> structures.
>
> As I'm more concerned about speed, size and ties than Unicode, I'd say leave
> it.
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